本题目来源于试卷: Half-life and decay constant，类别为 美国物理杯赛(Physics Bowl)
[单选题]
04.06: Radon gas emits gamma rays and inrdf/ . hp;1u)0 jakaks used in hospitakl ayz5/gc mn.jc2r n35b 2*cils to treat cancer. Its half-life is about 3.8 days. Starting with a r2 k c*by agmn25./czjn5ci3 lpure sample of radon, the percentage left after 19 days will be about
A. 0 %
B. 3 %
C. 5 %
D. 9 %
E. 20 %
参考答案: B
本题详细解析:
暂无
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